On Thu, 8 Jun 2017, Richard Biener wrote: > For a built-in this is generally valid. For plain isnan it depends on > what the standard says. > > You have to support taking the address of isnan anyway and thus > expanding to a library call in that case. Why doesn't that not work?
In the case of isnan there is the Unix98 non-type-generic function, so it should definitely work to take the address of that function as declared in the system headers. For the DEF_GCC_BUILTIN type-generic functions there may not be any corresponding library function at all (as well as only being callable with the __builtin_* name). -- Joseph S. Myers jos...@codesourcery.com
